Adjustment Concepts
Two basic families of elevation and windage adjustment assemblies are available
with many different options in calibration and/or range of travel
with more coming in the future. The same basics will be constructed for use
in any short range (SN-4, -8, or comparable) scope, but also are applicable
to long range scopes (SN-1, -2, or comparable). A selection of screw thread
fineness (from 32 threads per inch, up to 56 T.P.I. or more) and alternative
click ring serrations (from 40 notches up to 72 notches per revolution) will
provide any degree of movement per click that is desired, from the coarse
1
M.O.A. up to 1/10 M.O.A. per click or anything in between. Length of the adjust
screw is modified to give enough point-of-impact control for short range
50 M.O.A. adjustments, or to accommodate more than 150 M.O.A. travel that
can be needed for 1000 yard or greater working range guns suited by
the target models.
U.S.#1 - The generic U.S. adjustment is comprised of a screw with integral
clicker that is rotated by the knob to effect in or out motion of
internal optical components which change point of aim. The clicker rides over
a mating click ring with a series of notches around its periphery that
produces a number of distinct, sensible and audible, detent positions. A broad
foot is attached to the bottom of the screw, bearing on the movable
optical assembly within the scope that changes reticle position in the field
of view. The turret bushing houses all the elements and secures them to the
scope body flat surfaces. A calibrated cylinder is created to display the
increments of movement, and can be ruled to describe the ballistic profile
of any
variation in cartridge loading, barrel length, operating range, or any scope
magnification setting. The height of the dust cap, knob, screw, click ring,
bushing
and cylinder defines the total travel capability and is limited only by the
clearances between scope tube and internal tube. The knob rises and recedes
to
make the changes needed. The adjust knob is attached to the adjust screw through
a tight, no-slip taper joint that is bound in position by a top cap screw,
which allows the knob position to be reset on its datum once the rifle/scope
boresight is achieved.
U.S.#4 - This is a B.D.C. (Bullet Drop Compensatory) knob system. The exterior
has the caliber and yardage increments from 100 yards or
meters to 600 or 700 yards or meters, depending on how much bullet drop we
can get in one full revolution of the knob. The thread rate and engraving
must be custom made for each caliber. A blank spool and instructions for doing
your own B.D.C. can be provided also. After perfecting your drop and
establishing your line increments we can engrave the lines on your spool or
an extra spool. This is a very quick system for rapid ranging. It is not an
extremely precise system - no B.D.C. ever is.
U.S.#8 - These novel and revolutionary non-rising adjustment assemblies are
low in profile, and provide wide adjustment range in a compact package.
The knob is joined to the adjustment nut, with its integral clicker, through
a tapered interface secured with two small screws. Similar to the generic
assembly
above, the clicker rides over click ring serrations to give positive detents,
however the click ring is shortened to take advantage of constant height elements.
Only the screw, which is constrained from rotation by an axial pin, rises
and falls as it is driven by the rotating nut/knob pair. The current design
projects
only 0.55 inches above the scope body flat surfaces, but can change the point
of aim up to 100 M.O.A. in either direction from center in a typical 4x scope!
This has never been achieved before to our knowledge.